An advanced research that gives the possibility to the player to spy the technology tree of the others players would be very usefull for some subtle victory condition (for example science victory with the sophons) because it permit a better anticipation of the global management of our opponents. 


For example :
- check if a military faction research more energetic or ballistic weapons.
- check if a dust-base faction is close to open a commercial path.
- check if the overcolonisation research are the priority of the opponent.

Lot of information are hidden in the technology tree, balancing that may be difficult.